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Abstract

A prism coupling device is shown in which a spring coupling mechanism maintains contact between the prism and a thin film at both cryogenic and elevated temperatures.

Country

United States

Language

English (United States)

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Prism Coupling Device

A prism coupling device is shown in which a spring coupling mechanism
maintains contact between the prism and a thin film at both cryogenic and
elevated temperatures.

The prism coupling device includes a spring activated coupling mechanism 1,
which provides a force sufficient to keep the prism 2 in intimate contact with the
thin film 3 over a temperature range of + 125OEC, for example. The spring
activated coupling means 1 comprises bar members 4 separated by spring
members 5. The force produced by coupling means 1 is adjusted by means of
thumb screw 6 which is threaded in frame member 7 in a position to engage one
of the bar members 4.

The prism coupling device is useful in the investigation of optical properties of
thin films, for example. In this usage, laser light can be coupled into the thin film
3 upon which the prism 2 is pressed. The temperature of this coupling assembly
can then be varied by attaching to a heater/refrigerator block 8.

For measurements at cryogenic temperatures (<0OEC), the entire assembly is
enclosed in an evacuated enclosure which is outfitted with thin windows for laser
beam entry and exit.